how can i calculate the equation

Question

X=( a*100)/(b+a), where a/b=0.513

 

Answer 1

x = (100a)/(b+a)

 

a/b = 0.513, so a = 0.513*b

 

Substitute 0.513b in place of a:

 

x = (100*0.513b)/(b + 0.513b)

 

x = 51.3b/(1.513b)

 

x = 51.3/1.513

 

Solve for x.